Ice-cream freezer.



G. W..P0ILL0N.

ICE CREAM FREE/ZRR. APPLIOATTOIN 'FILED MAR.2,1908.

Patented Apr. 5, 1910.

Weight of the freezing mixture contained in the can sinks down into the softening cream, thereby exposing more freezing surface to the cream and causing it to harden again. This re-freezing keeps pace automatically with the melting, so thatv although the ice chamber may have forced its Way well into the mass of cream, thev latter will be found to be stiff practically as long as any unmelted ice remains in the ice chamber.

I have found by a. number of practical experiments that the ventilating pipes, as C, Gr, accelerate the freezing of the cream considerably. Thus I have found thata quantity of cream which, in a freezer with 'vex'itilating pipes, can be frozen in an hour or less, re-

quires as much as two hours if no ventilation f is placed in the can the air therein is of the atmosphere.

is rovided. I am not prepared to explain definitely the reasons for this effect, but it seems to depend upon the air in the cream chamber above the cream. When the cream course at the temperature ofthe surrounding atmosphere, and is much above the freezing point. 'This air, if confined 1n the chamber,

seems to give up its heat very slowly, and, as.

it's temperature falls, may even absorb heat from the cover E, which is in Contact with But be that as it may, I have found that with the pipes C, G, provided, the air, as soon as the cover is in place on th l cream chamber, begins to escape through th vertical pipe G, while fresh air enters through the pipe C.' The air flowing in, however, is thoroughly chilled in its passage through` the pipe C, so that the original body of comparatively warm air above the cream is soon replaced by cold air. This circulation is kept up as long as the temperature of the cream is much above the freezing point, and appears to cease altogether When the freezing begins. In order to insure that the air entering through the pipe C shall be thoroughly chilled, the pipe should be surrounded With ice, as shown. I .have also found that somewhat better results are obtained by making theinlet pipe about twice the capacity of the outlet pipe, while the latter should extend Well above the top ofthe outer receptacle A.

.I prefer to make the cream and ice chambers cylindrical in form, and also prefer to have their sizes proportioned about as shown. For making a quart of ice cream I have used, with good results, a cream chamber about six inches in diameter and seven and a half inches high, and the ice chamber four inches in diameter and nine inches high, measuring from the apex of the bottom. The outlet air pipe used with this freezer was about three-eighths of an inch in diameter and the inlet pipe about a half inch in diameter.

-as set forth.

It is to be understood of course that the device herein specifically described is merely the preferred form of my invention, which may be embodied in various forms without departure from its proper scope as defined by the appended claims.

1What I claim is:

l. In an ice-cream freezer, the combination of a cream chamber; :a removable closure on the upperv end thereof, said closure being provided with a central opening; a sleeve around'said opening, extending below the closure and having its lower edge serrated; and an ice chamber adjustable vertically insaid sleeve and having its bottom pointed or conical in form, as set forth.

2. In an ice-cream freezer, the combination of a cream chamber, an ice chamber of whereby the air admitted through said h0ri-.

zontal pipe will be chilled before reaching the cream chamber, as set forth.

In an `ice-cream freezer, the combination of a cream chamber of `cylindrical form; an outer ice chamber surrounding the cream chamber an air-inlet pipe extending laterally from the top of the cream chamber across the outer ice-chamber whereby to be exposed directly to the refrigerant therein; a closure for the cream chamber, havin a central opening; a sleeve around sai opening; an ice chamber of smaller diameter than the cream chamber, arranged for adjustment in said sleeve; and an air-outlet pi e extending upwardly Vfrom the closure o the cream chamber; as set forth.

Li. In an ice-cream freezer, the combina-4 tion of an outer receptacle for a freezing medium; acream chamber in said recepn tacle, provided with a lateral air-inlet pipe extending through the Wall of the receptacle and inposition tobe subjected'directly to the freezing medium in said receptacle; a closure for the cream chamber, having an upwardly extending air-outlet pipe near its edge and havin a central opening; a sleeve around the saidgv opening; and an ice'chamber extending through the slceveinto the cream chamber and removable therefrom;

f chosen W. romrfon. Y l/Vitnesses JOHN C. Kean, M Laweon Dyna. 

